US3880665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hardening with a heterocyclic carbamoyl ammonium compound of a photographic material containing a silver halide layer
Assignee: Agfa Gevaert AG
•
Filing: 1973-05-21
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Granted: 1975-04-29
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Expires: 1993-05-21
Abstract
Abstract As rapidly acting hardeners for protein-containing photographic layers carbamoyl ammonium compounds are used the quaternised nitrogen atom of which being present in a 5- or 6-membered heterocyclic aromatic group.
Inventors
- 👤 Wolfgang Himmelmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:59
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/16; C07D213/20; C07D213/24; C07D213/28; C07D213/30; C07D213/60; C07D213/72; C07D213/75; C07D213/78; C07D213/81; C07D213/82; C07D217/00; C07D217/02; C07D217/10; C07D277/00; C07D277/02; C07D277/20; C07D277/22; C07D295/00; C07D295/16; C07D295/20; C07D295/205; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
48 words
A PROCESS FOR PROVIDING A PROTEIN-CONTAINING BINDER SELECTED FROM THE GROUP CONSISTING OF GELATIN, CASEIN, AND ZEIN IN A PHOTOGRAPHIC SILVER HALIDE EMULSION LAYER COATED ON A SUPPORT WHEREIN THE IMPROVEMENT COMPRISES INCORPORATING IN A BINDER FOR THE LAYER A HARDENING AMOUNT OF A HARDENER OF THE FORMULA
Claim 2
Dependent Claim
48 words
A PROCESS FOR PROVIDING A PROTEIN-CONTAINING BINDER SELECTED FROM THE GROUP CONSISTING OF GELATIN, CASEIN, AND ZEIN IN A PHOTOGRAPHIC SILVER HALIDE EMULSION LAYER COATED ON A SUPPORT WHEREIN THE IMPROVEMENT COMPRISES INCORPORATING IN A BINDER FOR THE LAYER A HARDENING AMOUNT OF A HARDENER OF THE FORMULA
Claim 3
Dependent Claim
16 words
A process according to claim 1, characterised in that the hardener is applied from aqueous solution.
Claim 4
Dependent Claim
16 words
A process according to claim 1, characterised in that the hardener is applied from alcoholic solution.
Claim 5
Dependent Claim
16 words
A process according to claim 1, characterised in that the hardener is applied from aqueous-alcoholic solution.
Claim 6
Dependent Claim
49 words
A process according to claim 1 in which the hardener is added to the casting solution of the layer which is to be hardened and the hardener is used in quantities of 0.2 to 6% by weight based on the weight of the protein-containing binder in the casting solution.
Claim 7
Dependent Claim
27 words
A process as claimed in claim 1 in which the hardener is applied to the layer before processing, said hardener being in a 0.2 to 10% solution.
Claim 8
Dependent Claim
28 words
A process as claimed in claim 5 in which the hardener is coated on the layer in a 0.2 to 5% solution and the layer is then dried.
Claim 9
Dependent Claim
19 words
A process according to claim 1 characterized in that the hardener is used for hardening photographic multilayer color materials.
References Cited (Backward Citations)
US2950197A
Cited
US3676143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |